Our goal is to identify the inflaton among the gauge singlet massless spectrum of the model and derive an inflationary potential consistent with present observations. We focus on Starobinsky-type inflation [1]}, which was shown [2]}, [3]}, [4]}, [5]}, [6]}, [7]} to be naturally embeddable in the framework of \(N=1\)  no scale supergravity [8]} which is the generic low-energy effective field theory of string models and in particular of fermionic constructions where it is calculable to all orders in the string slope parameter \(\alpha ^{\prime }\)  [9]}, [10]}, [11]}.
